Improvement in steam-heater boilers



2 Sheets--Sheet 1.

F BRACKNEY.

Steam-Heater Boiler.

N0. 123,767. A Patented Feb. 20,1872.

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F. BRACKNEY.

Steam-Heater Boiler.

No. 123,767. Patented Feb. 20,1872.

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FRANCIS BRACKNEY, OF BALTIMORE, MARYLAND.

IMPROVEMENT IN STEAM-HEATER- BOILERS.

Specification forming part of Letters Patent No. 123,767, dated February20, 187'?.

ving in, together with its other features, hereinafter enumerated, anumber of cast-iron sections, each one entire, complete, and distinct initself, the whole, however, of which, when ,tted and joined together,only .making up and composing the one sectional boiler. The differentsections are connected by pipes, having threads cut upon them, whichscrew into the sections and hold them together. The fire-box or furnaceis placed in the center of the boiler; and tubes running therefrom eachway into smoke-chambers near the end of the boiler return thence into aflue, of circular or other shape, which runs completely throughtheboiler at its center, from front to back. The smokeconnection is madeto the front or back of the boiler by' means of a T-pipe, so placed thatan opening is preserved through it and the center iue, with which itconnects. A lifting door, m, on a hinge, covers the end of theT-connection, so attached with other mechanism as to be operated upon bythe steam-pressure and to regulate the draught.

. It willbe seen that, as each section is areceptacle for Water and asteam-generator independently of all others, the joints between the sameare not exposed to the action of the lire; neither are there any jointsat which leakage can possibly ensue, except at the connecting-pipes, theprevention of which at these points is merely a matter of ordinaryworkmanlike skill.

In the further description of my invention which follows, due referencemust be had to the accompanying drawing, in which- Y Figure 1 is a frontelevation of my invention. Fig. 2 is a vertical longitudinal section ofthe same. Fig-3 is a vertical transverse section through the fire-box online WX. Fig. 4 is a vertical transverse section through line XY.

Similar letters of referenceindicate similar parts of my invention.

A A represent the center or furnace sections. A A are plain sections. AA are the smokechamb er sections. Each section is entire in itself', andno steam -joints whatever are required,

except at the point of attachment, a. The joints y at b are only of suchcharacter as may be found necessary to render them smoke-tight. Thepipes Gr have threads cut upon. them at each end, the end g having alonger thread than at g. The object of this difference in the length ofthe threads is to facilitate the Work of connecting the sections. Werethe threads not so arranged, when the faces b b are brought together asa joint, the pipes could not be inserted. As it is, the end g, uponwhich is a locknut, g, now run back, is screwed into and l through thesection far enough to allow the end g. to enter the opposite hole in theother section. The pipe is then screwed into the latter section, asufficient part of its length still remaining in the other, and thelock-nut g brought to its proper place against the side of the section.If desired, tie-bolts h may be run through these pipes, extendingthrough all the sections, to assist, if necessary, in thesecuring of theboiler-sections, or for other purposes. B B represent the lower seriesof tubes,

-which run from the furnace C to the smokechambers D D. E E are theupper or return tubes, extending into and between the smokechambers D Dand the smoke-flue F. By the position of the furnace C in the center ofthe boiler, and the tubes running each way to the smoke-chambers, andreturning thence in to the smoke ilue, a double radiating draught iscaused. The smoke-chambers D D are formed within the sections Al A,andAthe smoke-flue F within those of A A, one-half being in each. The flue Fextends entirely through the boiler from front to back, its cleaning outbeing thereby facilitated. The sections A A and A A', next to them, aresomewhat deeper than the others, that ample height under theY grate-barsc may be had. Those part-s, H, of the sections wherein the pipes Gr areinserted are set back from the faces b, at which the sections join, toallow for the insertion of the pipes. K K are cleaning-out iues,reaching into the smokechambers D D. To the center due F I attach, ateither the front or back of the boiler, a T

smoke-connection, L, and at the other side of the boiler a eap, M, overthe opening. The draught-door is represented by m.

The f'eed of water can be maintained by any suitable means whereby allthe sections may be equally supplied, and any ordinary method adoptedfor ascertaining the pressure therein.

The pressure will' liever be high, this appameans are adopted for thecleaning` out of the smoke-tubes and flues.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

l. The combination of the center flue F, extending transverselycompletely through the boiler, with the double series of return-fines EE, when arranged substantially as and for the purposes herein specified.

2. In 10W-pressure steam-'heating` boilers, an improvement consisting ina furnace, O, placed midway of thefront elevation, as shownin Figs. land 2, and as used in connection with the ldouble series ofdirect-acting flues B B, the

double series of return-fines E E, and the center flue F, substantiallyas set forth.

3. A counter recess, formed Vby the setting` back of the parts H in theadjoining;` faces of any two of the separate sections, substantially asset forth, for the purpose speeited.

FRANCIS BRACKNEY. i

Witnesses:

M. MENDELS, J osHUA J. H. TYsoN.

